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25.3 Functional description
UART bidirectional communication requires a minimum of two pins: RX, TX
The frame are comprised of:
An Idle Line prior to transmission or reception
A start bit
A data word (8 or 9 bits) least significant bit first
1, 1.5, 2 Stop bits indicating that the frame is complete
The USART interface uses a baud rate generator
A status register (UART1_RISR)
data registers (UART1DR)
A baud rate register (UART1_IBRD,UART1_FBRD)
APB interface
Register
Block
UARTCLK
UARTn Interrupt
Interrupt
Control &
Status
Figure 46 shows the UART character frame
1
0
n
W7500x Reference Manual Version1.1.0
UART
Read data[11:0]
Write data[7:0]
32x8
transmit
FIFO
Control and Status
Baud rate divisor
Baud rate
generator
FIFO flags
UARTTXINTR
UARTRXINTR
UARTMSINTR
FIFO status and Interrupt
UARTRTINTR
UARTEINTR
UARTINTR
Figure 45. UART0,1 Block diagram
LSB
5-8 data bits
Start
txd[7:0]
rxd[11:0]
Baud16
Receive
Transmit
FIFO
FIFO
status
status
1-2
MSB
Stop bits
Parity bit,
if enabled
32x12
receive
FIFO
UARTTXD
Transmitter
UARTRXD
Receiver
nUARTRI
nUARTCTS
nUARTDSR
nUARTDCD
nUARTDTR
nUARTRTS
nUARTOut1
nUARTOut2
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